hover tooltip for top-level identifiers with source maps should show value

[jmesserly]

we generate top level fields as exports.name, which the JS debugger won't show the value for. babeljs generates a pattern that keeps a local around. We could do that too, does it seem worth it?

export let foo = 1;
foo++

desugars to

var foo = exports.foo = 1;
foo = exports.foo += 1;

the local "foo" means that "foo" hover will work

[jmesserly]

(but the tradeoff is uglier code for the JS reader)

[jmesserly]

and here's a live version of that babeljs example

[jmesserly]

@jacob314 I believe this sort of thing is fixed by the debugger extension. so closing.